Solid State Hard Drive

[Tellos Athenaios]

I don't get why games would download faster onto an SSD? I have a 50MBit connection and it's nowhere near fast enough to keep my HDD busy.

They would not download faster. Your OS would boot faster, your programs and files would load faster, though. So once that download had completed your game might well run faster.

2. if you outsource too many files, there's no point in having an SSD, right? For example the page file would greatly benefit from being on the SSD I guess, since it's closer to the speed of actual RAM, yet it would reduce the lifetime a lot, kinda hard to decide there.

SSD's are not as fast as RAM, not by orders of magnitude ... They do not have that kind of bandwith, or latency; so you will notice swapping as being rather slow whether or not the swapping occurs to the SSD or not.